High-Strength Seamless Carbon Steel Tubes for Boiler & Heat Exchanger Service
Manufacturer: Womic Steel
ASTM A210 Grade C is a high-strength seamless carbon steel boiler tube designed for higher pressure and higher temperature service compared with A210 Grade A1. Due to its increased carbon and manganese content, ASTM A210 Gr.C offers superior mechanical strength while maintaining good ductility and weldability, making it one of the most widely used boiler tube materials in modern power generation and industrial thermal systems.
As an experienced manufacturer and global supplier, Womic Steel provides ASTM A210 Grade C boiler tubes with strict dimensional control, stable metallurgical quality, and full compliance with international boiler and pressure equipment standards.
Standard Scope and Engineering Significance
ASTM A210/A210M is a specification covering seamless medium-carbon steel tubes intended for boilers, superheaters, and heat exchangers.
Grade C represents the higher-strength grade within this standard, typically selected for main boiler tubing, superheater sections, and high-pressure water-wall systems.
For pressure equipment projects, ASTM A210 Grade C is also supplied as ASME SA210 Grade C, fully acceptable for ASME Boiler and Pressure Vessel Code applications.
Chemical Composition of ASTM A210 Grade C
The enhanced strength of ASTM A210 Gr.C comes from its optimized carbon–manganese balance, ensuring improved pressure resistance without sacrificing fabrication performance.
Table 1 – Chemical Composition (wt.%)
|
Element |
C |
Mn |
Si |
P |
S |
| ASTM A210 Gr.C | ≤ 0.35 | 0.29 – 1.06 | ≥ 0.10 | ≤ 0.035 | ≤ 0.035 |
This composition provides higher tensile strength and improved creep resistance under elevated temperatures compared with Grade A1.
Mechanical Properties and Strength Advantage
ASTM A210 Grade C is selected when higher internal pressure and thermal stress are present in boiler systems.
Table 2 – Mechanical Properties
|
Property |
Requirement |
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 30% |
These mechanical properties ensure reliable performance under long-term high-temperature operation, pressure fluctuations, and thermal cycling.
Manufacturing Process and Heat Treatment
All ASTM A210 Grade C tubes supplied by Womic Steel are produced using a fully seamless manufacturing process, including hot rolling or extrusion, followed by cold drawing when tighter dimensional tolerances are required.
Table 3 – Heat Treatment Requirements
|
Tube Condition |
Heat Treatment Method |
Purpose |
| Hot-Finished | Normalizing or Isothermal Annealing | Refine grain structure and stabilize strength |
| Cold-Drawn | Annealing or Normalizing + Tempering | Relieve stress and restore ductility |
Controlled heat treatment ensures uniform mechanical properties, stable microstructure, and excellent service reliability.
Size Range and Dimensional Control
Womic Steel supplies ASTM A210 Grade C boiler tubes in a wide dimensional range to meet different boiler designs and heat exchanger layouts.
Table 4 – Standard Supply Range
|
Item |
Range |
| Outside Diameter | 12.7 mm – 114.3 mm |
| Wall Thickness | 1.5 mm – 14.0 mm |
| Length | Up to 12 m (fixed length available) |
All tubes are produced in strict accordance with ASTM A210 dimensional tolerances, ensuring excellent roundness, straightness, and wall thickness uniformity.
Inspection, Testing, and Quality Control
Each ASTM A210 Grade C tube from Womic Steel undergoes a complete inspection and testing program to guarantee safety and compliance.
Table 5 – Inspection & Test Program
|
Inspection Item |
Standard |
| Chemical Analysis | ASTM A751 |
| Tensile Test | ASTM A370 |
| Flattening / Flaring Test | ASTM A210 |
| Hydrostatic Test or NDT | ASTM A210 |
| Dimensional Inspection | ASTM A210 |
| Visual Examination | ASTM A450 / A530 |
Mill Test Certificates are issued in accordance with EN 10204 3.1, with full traceability to raw material heat numbers.
Typical Applications of ASTM A210 Grade C
ASTM A210 Gr.C boiler tubes supplied by Womic Steel are widely used in:
l Power plant boiler water-wall tubes
l Superheaters and reheaters
l Industrial steam boilers
l Heat exchangers and economizers
l High-pressure thermal piping systems
Grade C is particularly suitable for higher-pressure zones where enhanced strength is required.
Packaging, Delivery, and Supply Capability
Womic Steel applies export-standard packaging, including steel-strapped bundles, plastic end caps, moisture protection, and wooden cases when required. This ensures safe transportation during long-distance shipments.
With stable raw material sourcing, flexible production scheduling, and no minimum order quantity, Womic Steel can support both single-tube urgent replacement and large-scale boiler projects, delivering consistent quality with competitive lead times.
Why Womic Steel for ASTM A210 Grade C
By combining mature seamless tube manufacturing technology, strict heat treatment control, comprehensive inspection systems, and strong international logistics capability, Womic Steel delivers ASTM A210 Grade C boiler tubes that meet the demanding requirements of global boiler and energy industries.
Website: www.womicsteel.com
Email: sales@womicsteel.com
Tel/WhatsApp/WeChat: Victor: +86-15575100681 or Jack: +86-18390957568
Post time: Jan-29-2026